package com.ibeetl.code.ch04;

import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

import java.util.concurrent.TimeUnit;

/**
 * 静态方法调用省去了虚方法查找，性能好
 * @author 公众号 闲谈java开发
 */
@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 5)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Threads(1)
@Fork(1)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@CompilerControl(CompilerControl.Mode.DONT_INLINE)
@State(Scope.Benchmark)
public class StaticMethodCall {
	CommonUtil util = new CommonUtil();

	@Benchmark
	public void instanceCall() {
		util.call();
	}

	@Benchmark

	public void staticCall() {
		CommonUtil.staticCall();
	}

	@Benchmark
	public void finalCall() {
		util.finalCall();
	}

	static class CommonUtil {

		public void call() {
		}

		public static void staticCall() {
		}

		public final void finalCall() {

		}
	}

	public static void main(String[] args) throws RunnerException {
		Options opt = new OptionsBuilder().include(StaticMethodCall.class.getSimpleName()).forks(1).build();
		new Runner(opt).run();
	}
}


